Rotary steam-drier.



A 0 9 1 0% mm U A D E T N E T A P S E L I B W .J 00 6 6 b 0- N ROTARYSTEAM DRIER APPLICATION FILED MAY 6, 1904.

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N0 MODEL.

PATENTED AUG. 9, 1904.

5. W. BILES.

ROTARY STEAM DRIERa APPLICATION FILED MAY 5, 1904.

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No. 766,868. PATENTED AUG. 9, 1904. J. W. BILES.

ROTARY STEAM DRIER.

APPLICATION rum) MAY 6, 1904.

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1 wire Patented August 9, 1904.

ROTARY S'l"EAM-DFHEFL SPECIFICATION forming part of Letters Patent No.766,868, dated August 9, 1904.

Application filed y 6, 1904. Serial No. 206,665. (No model.)

To all whom it may concern:

Be it known that 1, JOHN W. BILns, a citizen of the United States,residing at Louisville, in the county of Jefferson and State ofKentucky, have invented a new and useful Rotary Steam-Drier, of whichthe following is a specification.

This invention rel ates to rotary steam-driers.

The object of the invention is to provide a rotary steam-drier ofimproved construction and which is simple and efficient in operation.

A further object of the invention is to provide improved means in arotary steam-drier for drawing off the water of condensation.

A further object of the invention is to provide means for protecting theinner wall of the casing against corrosion during the operation of thedevice.

A further object of the invention is to provide means permittinglongitudinal expansion and. contraction of the steam-pipes.

Other objects of the invention will appear more fully hereinafter.

The invention consists, substantially, in the construction, combination,location, and arrangement of parts, all as will be more fullyhereinafter set forth, as shown in the accompanying drawings, andfinally pointed out in the appended claims.

Referring to the accompanying drawings, and to the various views andreference-signs appearing thereon, Figure l is a view in verticalcentral longitudinal section of a rotary steam-drier embodying theprinciples of my invention. Fig. 2 is a view in transverse section onthe line 2 2 of Fig. 1 looking in the direction of the arrows. Fig. 3 isa view in transverse section on the line 3 3 of Fig. 1 looking in thedirection of the arrows. Fig. t is a view in transverse section on theline a l of Fig. 1 looking in the direction of the arrows. Fig. 5 is aview' in end. elevation looking toward the left-hand end'of theapparatus. Fig. 6 is a broken detail view in transverse section, showingthe means for supporting and arranging the protective lining for thecasing of the drying-chamber.

The same part is designated by the same reference-sign wherever itoccurs throughout the several views.

1n the practical operation of rotary steamdriers wherein a rotary casingis employed into one end of which the material to be dried is fed andfrom the other end of which the dried material is delivered and whereinsteam is employed as the drying or heating medium it is important thatany condensation which takes place within the heating-pipes may bereadily withdrawn and removed from the system of heating-pipes. It isalso important and desirable to provide means for protecting the shellof the drying-chamber against corrosion or the corrosive action of acidscontained in the material to be dried, and in the construction of rotarysteam-driers employing headers at each end, which headers are connectedby steam-pipes for circulation of the heating medium, it is desirable toprovide means whereby the heating-pipes are per mitted longitudinalexpansion or contraction. The attainment of these desirable objects isamong the special purposes of the present invention.

In carrying out my invention I employ a rotary cylinder or casing A,constituting the d rying-chamber, and l arrange at the respective endsof said casing headers, which Ishall designate generally byreference-sigi'is B and C, and each comprising a central chambered hub,the chamber thereof being indicated by reference-signs I) and E,respectively. Ra d iating from the chambered hub E of header 1 arehollow arms or spokes, the channels of which are indicated byreference-sign F, (see Figs. 1 and 3,) and which open into an annularchamber H at the peri iihery of said header. Similarly the chamber 1) ofthe hub of header 1% is provided with radiating spokes having iassages Jand K, the chambers of passages K forming a communication between thechamber 1) and chambers L. 2.) Formed at the periphery of the header -B,and which I will call annular chambers,

the passages J alternate with the passages K, each of the passages Jcommunicating with one of the annular chambers L, the annular chambers Lbeing divided or separated from each other by the ,partitions M, whichare arranged to form end walls of the chambers L and on the right-handside of each of the cham- (See Figs. 1 and pipe being tapped through theshell P of a cylinder-chamber, which is divided into three segmentalportions Q, (see Fig. 2,) each pipesection delivering into a segmentalchamber of said cylindercasing P, said segmental chambers being closedat their inner ends and opening at their outer ends into the interiorchamber R of a neck S, with which communi cates a drain-pipe T. Theheaders B C are connected by two series of pipes, one series (designatedby reference-sign A) being located closely adjacent to the inner wall ofthe casing A and the other series being indicated by reference-sign Band being located or nested together in cylindrical form at the axialcenter of casing A. The pipes B communicate, respectively, with thehub-chambers D andEof the headers B C, while the peripheral pipes Acommunicate, respectively, with the annular passages L and H of headersB C, respectively. The header C is rigidly secured to the shell orcasing A, while the header B is mounted to move longitudinally of theaxis of easing A, thereby permitting of expansion and contraction of theheating-pipes.

In practice devices of driers of the class and type to which the presentinvention relates are mounted somewhat in inclined position from one endtoward the other to revolve axially. Any suitable means for supportingthe drier shell or casing and for imparting rotative movement theretomay be employed. I have shown means which arecommon in the art foraccomplishing this purpose and comprising rollers G, arranged insupporting relation with respect to the respective ends of the casing. I

The material to be dried may be delivered into the interior of easing Afrom the feed end-thereof and in any convenient manner. I have shown acommon form of feeding mechanism comprising a screw conveyer D, arrangedto deliver into the casing A through the hub of header C, and this endof the casing or apparatus I will call the feed end. The material may bedischarged from the easing A at the opposite end of the apparatus andthe dried material conveyed from the apparatus in any suitableorconvenient manner. I have indicated in Figs. 1 and 5 a conventionalarrangement well known in the art. for accomplishing the desired objectand comprisinga rotary screw conveyer E, to which the material isdelivered from the casing A through the space between the radiatingspokes of header B. In practice to secure the inclination of the drierthe cylindrical casing A is elevated or raised higher at the feed endthan at the discharge end.

In order to protect the inner Wall of the corrosive effect of acidscontained in the material to be dried during the operation of thedevice, I propose to provide the inner wall of the casing with aremovable lining. Linings for driers of the type to which this inventionrelates have been difficult of application and arse in the devices ofprior construction by reason of the difiiculty of replacing or renewingthe lining on account of the limited space or area between the innerwall of the casing A and the peripheral series of heater-tubes A. Inorder to overcome this difliculty, I propose to employ a lining made upof sections F, each section being preferably curved to the segment of acircle of suflic'ient radius to enable such sections to be introducedinto the space between the series of peripheral pipes A and the innerwall or surface of cas-' ing A by slipping the same edgewise betweenadjacent pipes A. One edge of each of the segmental sections of liningis provided with a turned-over flange Gr, arranged to overlap theproximate edge of the adjacent segmental section, as; clearly shown inFig. 6,- thereby preventing the material being treated from gainingaccess to the space between the lining and the casing A. In order toprevent undue radiation of the heat within the casing A,'I propose tooffset the lining from the inner wall or surface of casing A, therebyforming practically a dead-air space between the an: ing and the casing.To accomplish this resnlt, I propose to bolt the segmentalliningsections to the casing A and to inter'pos'e be tween said casingand lining-sections a block or washer H, as clearly shown in Fig. 6';

The peripheral series of pipes A may be supported in any convenientmanner and at any convenient point intermediate the ends thereofas, forinstance,- by means of straps J, (see Fig, 4, -in a we'lhunderstood andwell-known manner, and similarly the cylindrical nest of central pipes Bmay be sup ported intermediate the ends thereof in any convenientmanneras,- for instance, by means of a plate K, through which saidpipe's pass, said supporting-plate K being connected by arms L tothecasing A. i The heating mediumas, for instance, steam (but in thisrespect I do not desire to be 'limited)-is supplied to the drier in anyconvenient manner-as, for instance, through a supply-pipe Mthe end ofwhich is ar ranged to project through the cylindrical cas ing P; so asto deliver the heating medium into the hub chamber D of header B, whencethe heating medium reaches and "circulates shell or casingA againstcorroding or thethrough the central nest of pipes B and also through theradial passages K; reaches annular chambers L, thence circulatingthrough reasee the peripheral series of pipes A to header U at theopposite end of the apparatus.

If desired, suitable manholes may be provided for each of the headers BC, as indicated at N. i

A drier constructed in accordance with the principles of my invention iswell adapted for use in drying any kind of material requiring the use ofa drier. I do not desire, therefore, to be limited in respect to the useto which my invention is to be put or to the character of the materialto be employed.

The operation of the apparatus is as follows: The material to be driedis delivered into the feed end of the casing A by the feeding apparatusemployed, such material falling into the raised or upper end of thecasing. By reason of the downward inclination of easing A toward thedischarge end and the rotations imparted to said casing the material tobe dried falling upon the lowermost point of the cylindrieal casing atthe feed-in end thereof is caught by the ridges formed by the liningsections at the junction of the edges thereof and by and between theperipheral pipes A and are thereby carried with the revolving casing asthe rotation thereof continues until it is raised to a sufficient heightto spill or fall over the supporting ledges or ridges formed by thelining-sections and pipes A and falling down and spreading over andthrough the central nest of pipes B, being progressed spirally in thismanner lengthwise through the casing A, being finally delivered. fromthe casing in dried condition and carried away or removed by a conveyerE or otherwise. Thus it will be seen that the lining performs a triplefunction. 7 Being offset from the inner wall of thecasing, it serves toprevent undue radiation of the heat, and being inthe form of arc-shapedsections they perform the further function of ledges or flights forreceiving and carrying upwardly the material to be dried during therotative movement of the casing, and in addition they serve to protectthe casing A against corroding or the corrosive effect of any acidscontained in the material to be dried. .The water of condensationforming within the heating tubes or pipes A B, where steam. is employedas the heating medium, drains toward the header B by reason of theinclination of said pipes and is delivered into the annular passages L,collecting in the lowermost portions of said annular passages, wheresuch condensation is caught by the partitions M, thereby being deflectedor guided down the alternate radiating passages J and thence through theshort pipe-sections 0 into the compartments Q of cylindrical casing P,thence being delivered into the passage R of neck S and through thedrain-pipe T.

By employing only each alternate radiating passage J to carry off thecondensation I am enabled to employ pipe-sections O of large area,thereby avoiding the possibility of clog ging due to a failure of thedrain to take care of all of the condensation formed during theoperation of the device, and this I regard as a most important featureof my invention. By mounting the header B for movement in the directionof the axis of rotation of easing A provision is made for expansion andcontraction of the tubes or pipes A B, connect ing the headers.

The moisture which is driven off by the steam for heat furnished throughthe heatingpipes while the material is passing through the cylinder maybe carried off from the easing in any convenient manner. In practicethis moisture may be drained off by means of a blower or fan (not shown)through the open spaces between the radiating hollow spokes of header C.

It is obvious that many variations and changes in the details ofconstruction'and arrangement would readily 'occur to persons skilled inthe art and still fall within the spirit and scope of my invention. I donot desire to be limited or restricted, therefore, to the exact detailsshown and above described; but,;

Having now set forth the object and nature of my invention and aconstruction embody-- ing the principles thereof, what I claim as newand useful and of my own invention, and desire to secure by LettersPatent, is

1. In a rotary drier of the type described,

the combination with adrum or casing, headers arranged at the endsthereof, heating-pipes connecting said headers, means for supplying aheating medium to said pipes, in combination with a lining applied tothe inner wall of said casing, said lining madein removable sections,for the purpose set forth.

2. In a drier, a drum or casing, headers arranged at the ends thereof,heating-pipes connecting said headers, in combination with a lining forthe inner wall of said casing, said lining made in removable sections,said sections being offset from the inner surface of said casing, forthe purpose set forth.

3. In a drier, a drum or casing, heatingpipes arranged therein andadjacent .to the inner periphery of said casing, in combination with alining applied to the inner wall of said casing and between saidheating-pipes and said inner wall, said lining havingloi'igitudinallyextending ridges on the inner surface thereof, for thepurpose set forth.

i. In a drier, a drum or casing, heatingpipes arranged therein and adacent the SUI: face of the wallthereof, in combination with 5. In adrier, a drum or casing, means for" heating the same, and a lining forsaid casing,

IIO

said lining comprising removable segmentalshaped sections arranged edgeto edge, for the purpose set forth.

6. In a drier, a drum or casing, and means for heating the same, incombination with a lining for said drum or casing, said lining beingoffset from the inner surface of said wall or casing to provide adead-air space therebetween, for the purpose set forth.

7. In a rotary drier, a rotatively-mounted drum or casing, heating-pipesextending longitudinally therethrough and arranged adjajacent the innersurface thereof, in combination with a lining interposed between saidheating-pipes and the inner wall of said casing, said lining composed ofcurved segmental plates, and means for removably attaching said platesto the inner surface of said casing, for the purpose set forth.

8. In a rotary drier, a rotatively-mounted drum or casing, heating-pipesextending longitudinally therethrough and arranged adjacent to the innersurface of said casing, in combination with a lining interposed betweensaid pipes and the inner surface of said casing, said lining comprisingdetachable sections, each section having a bent flange at one edgethereof arranged to engage over the proximate edge of the adjacentsections, for the purpose set forth.

9. In a drier, the combination of a drum or casing rotatively mounted,and headers arranged at the ends thereof, heating-pipes connecting saidheaders, said headers provided with hub-chambers and annular chambersand a plurality of centrally-located exhaust-charm b ers and radiatinghollow spokes, the alternate hollow spokes forming communication betweensaid hub and annular chambers, and drain-pipes communicating with eachintermediate radiating passage of one of said headers and delivering toan exhaust-chamber, for the purpose set forth.

10. In a rotary steam-drier, a rotativelymounted casing or drum, headersarranged at the respective ends thereof and including annular and hubchambers, pipes communicating between said headers, radiating spokes,each having a single passage formed in said headers, the passage of eachalternate spoke of one of said headers arranged to open communicationbetween the annular and hub chambers of the same header, the passage ofeach intermediate spoke of said header being closed to said hubchamber,a cylindrical casing arranged at the center of said hub-chamber andcommunicating with an exhaust-pipe, and pipe-sections communicatingbetween said intermediate spoke-passages and said central cylindricalcasing, for the purpose set forth.

11. In a rotary steam-drier, a rotativelymounted drum or casing, aheader arranged at each end thereof and each having an annular chamberand a central hub-chamber, radial hollow spokes formed in each of saidheaders, and each having a single passage therethrough to opencommunication between the annular and hub chambers of theircorresponding headers, only the alternate spoke-passages of one of saidheaders forming such communication between the annular and hub chambersof said headers, a casing centrally mounted in said last-mentionedheader and having a plurality of compartments closed to the hubchamberof said header, the single passage of each intermediate radial spokebeing also closed to said hub-chamber, and a pipe-section communicatingbetween the single closed passage of each of said intermediate radialspokes and a corresponding compartment of said central casing, and adrain-pipe communicating with said central casing.

12. In a rotary steam-drier, a rotativelymounted drum or casing, pipesarranged therein, headers receiving the ends of said pipes, each headerincluding an annular and a hub chamber, radiating spokes, each having apassage therethrough, formed in one of said headers to opencommunication between the annular and hub chambers thereof, similarradiating spokes, each having a single passage therethrough, formed inthe other of said headers, partition-plates arranged to separate theannular chamber of said last-mentioned header into sections, the hollowpassage of each alternate radiating spoke of said header openingcommunication between a section of the annular chamber and thehub-chamber of said header, a casing having a plurality of compartmentscentrally located with respect to said header, said compartments beingclosed to the hub-chamber thereof, the single passage of eachintermediate spoke being closed to said hub-chamber but communicatingwith a section of said annular chamber, and a pipe connection betweenthe single passage of each of said intermediate spokes and a centralcasing-compartment, and a drain-pipe communieating with said centralcasing-compartment.

In witness whereof I have hereunto set my hand, this 3d day of May, 190in the presence of the subscribing witnesses.

JOHN BILES.

itnesses:

A. G. RONALD, A. E. RICHARDS.

